Hardware interview practice

Nonblocking event triggers

HardVerification UtilitiesSystemVerilog

What print order is guaranteed, and why?

Starting point

Question code

event e;
initial fork
  begin #1 ->> e; $display("T"); end
  begin #1 @e;   $display("W"); end
join

Choose one

A. W then T, because an event waiter has priority
B. T then W, because ->> schedules the trigger nonblockingly after active-region code
C. Only T, because @e always misses a same-time trigger
D. The order is nondeterministic because both delays expire at time 1

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